A small piece of damaged cable sheath can be repaired with good quality P.V.C. insulation tape.. BUT these days the quality of that is very poor in many cases and it may have carp glue, thus allowing the tape to come loose over time, especially if used in warm conditions. If possible the section could be oversleeved. If the damage is very bad replacement of the damaged cable will be required. If there is sufficient space the cable can be cut through and a junction box (joint box) used to re-terminate. You have not specified the cable size or type.
A small piece of damaged cable sheath can be repaired with good quality P.V.C. insulation tape.. BUT these days the quality of that is very poor in many cases and it may have carp glue, thus allowing the tape to come loose over time, especially if used in warm conditions. If possible the section could be oversleeved. If the damage is very bad replacement of the damaged cable will be required. If there is sufficient space the cable can be cut through and a junction box (joint box) used to re-terminate. You have not specified the cable size or type.
